The Arduino Watch provides augmented sensing of temperature and range, 16-bit color drawing program, Breakout game, and also tells the time in your choice of digital, binary, or analog. Additional sensors, devices, and programs are easy to add as any standard Arduino.
The source code can be downloaded from the google code page, code.google.com/p/arduino-watch.
Updates and news on the Arduino Watch can be found at OptimizedForce.com
This is a video that gives an overview of what the Arduino Watch can do.
Step 1: The Materials
1 Arduino Mini Pro 328 - 3.3V/8MHz available at SparkFun
1 FTDI Basic Breakout (if you don't have one) available at SparkFun
1 4D Systems OLED Module 1.5" (128x128 pixels) available at SparkFun
1 Blackberry Trackballer Breakout available at SparkFun (I'm sensing a theme of the supplier)
1 3.7V 1000mAh Li-Polymer battery available at SparkFun
1 LiPoly Fast Charger available at SparkFun
1 DS1307 Real-time clock available at Digi-Key
1 Crystal 32kHz available at SparkFun
Nuts and Bolts available at local hardware stores
2 #4 bolts 3/8" long
2 #4 bolts 1/4" long
4 #4 bolts 3/4" long
8 #4 nuts
(for the nuts and bolts I found the brass ones at Ace and the zinc ones at Home Depot)
~13" x 1 5/8" leather band for the outer layer (I used a wide leather belt)
~8" x 1 7/8" elastic band for the inner layer (I used another belt)
1/4" OD copper tube available at Home Depot
1/2" thick piece of wood for screen case, I usually use poplar wood.
6 right angle header pins available at MarVac
1 Connector Housing 6 pin housing (if you can find a 5 pin housing get that) available at MarVac
2 Connector Housings 1 pin housing
7 female pins available at MarVac
1 IDE ribbon cable (dig it out of that pile of cables you never use)
1 4D Systems OLED Module 0.96" (96x64 pixels) available at SparkFun will also work since I originally programmed the watch for that display until I accidentally broke mine and everyone was out of stock so I had to move to the next size up.
1 3.7V 900mAh Li-Polymer battery available at SparkFun smaller cheaper battery almost as much power.
1 Real-time clock module available at SparkFun or at RobotShop these modules would replace the real-time clock chip and the 32kHz crystal and give you a backup battery.
Step 2: The Software
The main file needed is the WatchRXX.pde (were XX is the current revision) and at the same location you can also download all the libraries needed for the Arduino Watch software.
Step 3: Preparing the Materials
Solder the right angle header pins to the Arduino so that you can connect the FTDI Basic Breakout board easily.
Cut the JST connector off of the battery and attach the single pin housings to the ends of the wire this tutorial is useful to teach how to crimp the wires.
Step 4: Carving the Screen Case
Step 5: Parts Layout
For the trackball to Arduino there needs to be a minimum of 7 wires (power, ground, button press, up, down, left, right). If you want to light up the trackball you can use more wires and connect to an available digital out.
For the display to Arduino there are 5 wires.
Step 6: Cutting the Watch Band
The screw holes are 1/8" diameter and the hole for the trackball is 1/2" diameter.
The large square in the picture was for the smaller display I was originally going to use and is not necessary. The smaller rectangle cut out is for the connection to the display which is necessary.
Step 7: Soldering Connections Diagram
The picture shows you what it will look like after following the next few steps.
Remember helping hands are always, well, helpful when soldering. And if your helping hands cut into your wires stick a clothes pin in the helping hand and put your wire in the clothes pin.
Step 8: Soldering the Trackball
After soldering put a little bit of hot glue over where the wires connect to the trackball board for improved strength.
Note: To make a more compact design wires should head out to the left in the picture (opposite the direction seen below) laying flat against the back of the trackball board.
At this point it is good to test that everything is wired correctly, you can do this by uploading the the Trackball Tester software found on the Arduino Watch google code page.
Step 9: Soldering the Display Connector
Use a Dremel (or other cutting tool) to cut off one of the pin slots on the Connector Housing 6 pin housing to make it a 5 pin housing. Also you can cut down the height of the housing so that it does not stick into your wrist as much.
Take the 5 wire piece of the IDE cable from the "Parts Layout" step and crimp the wires into the female pins and insert in the housing. To increase the strength of the connector (especially if you cut the height down) add a hot glue to where the wires come out of the housing.
Solder the other side of the wires to the Arduino as specified in the pin diagram from the "Soldering Connections Diagram" step.
At this point you can use the Arduino Watch software to test the setup. Upload the software with the display disconnected, then disconnect the power and connect the screen. You can then power the watch with either the battery or the FTDI. If everything is working right you should be able to navigate the displays with the trackball and run the programs from the menu screen. The time screens will just display 0:00 in their various formats.
Step 10: Soldering the Real-Time Clock
First trim the legs down on the real-time clock so that they don't poke other parts of the watch.
Then solder the 32kHz crystal to X1 and X2
The SCL is soldered to A5 and SDA to A4 as shown in the soldering chart from the "Soldering Connections Diagram" step. Then solder the power to Vcc and ground to ground.
At this point the Arduino Watch is fully functional for the basic functions, so power it up and test it out! If the clock doesn't run try power cycling and/or use the reset button on the Arduino. Sometimes it takes a couple cycles to the the real-time clock going.
Step 11: Solder the Extensions Header
Step 12: Steampunking the Watch
Magnifying lenses like the ones in the picture make a great addition to the look. You may need to remove one of the spacers to allow them to clip onto the screw or you can glue or solder the lenses to one of the spacers.
Step 13: Extensions: Range Finding
In future versions I may route the output to a vibrating motor or speaker to allow for someone with visual impairment to use the range finder as a cane.
Step 14: Extensions: Temperature Sensing
I'll be posting a separate short Instructable on how to make the glove but the sensors used are the one-wire Dallas 18B20 sensors.